Silencing ventilator for windows



Dec. 12, 1933. R. B. BOURNE SILENCING VENTILATOR FOR WINDOWS Filed Jan. 9, 1951 2 Sheets-Sheet l INVENTOR. Rom/v0 15. flouRA E BY 4 A TTORNEYS.

Dec. 12, 1933. R. B. BOURNE SILENCING VENTILATOH FOR WINDOWS Filed Jan. 9, 1931 2 Sheets-Sheet 2 INVENTOR.

Patented Dec. 12, 1933 UNITED STATES SILENCING VENTILATOR FOR WINDOWS Roland B. Bourne, Hartford, Conn., it! nor to The Maxim Silencer Company, Hartford, Conn., a corporation of Connecticut Application January .9, 1931. Serial No. 507,633

3 Claims.

This invention relates to devices for providing ventilation to a room through a window opening, and having means for excluding street and other noises which would otherwise enter through the opening.

It is one object of the invention to provide a device of this character which may be economically made and assembled and which may be quickly installed in windows having differingrsills, sashes and frames. Other and'further objects will be apparent from the following specification and claims.

In the accompanying drawings which illustrate one embodiment of my invention:

Fig. 1 shows a cut-away perspective view of a preferred embodiment of the invention;

Fig. 2 shows a plan view with parts cut away to show the interior of the device; and

Fig. 3 is a section substantially on line 3-3 of Fig. 2 showing the device in position in a window.

Referring to the drawings, 1 designates a generally rectangular, substantially flat casing adaptedto be positioned, as shown in Fig. 3, between the window sill 2 and the lower sash 3. The casing 1 is lined with sound absorbent material as at 26. Flanged box-like members 4 are adjustably secured to the sides of the casing by bolts 10 engaging in slots 9 formed in the members 4 (see Fig. 1). Holes 11 formed in the flanges of members 4 provide means for securely; attaching the device to the window frame. Strip members 5 and 6 are adjustably secured respectively to the top and bottom of the casing 1 by screws 8 engaging in slots '7 formed in the members 5 and 6. The members 4, 5 and 6 are formed of, or are faced with, compressible material 28 and together form an air and sound proof seal between the casing 1 and the adjacent parts of the window and window frame. The manner of mounting members 4, 5 and 6 permits them to be adjusted to register properly in windows having differently positioned sashes and frames. As shown, the members 4, 5 and 6 are positioned adjacent that face of the casing which is positioned outwardly of the window so that when the casing is mounted in the window the major portion of the casing is located within the room. This arrangement has certain advantages in that the movable parts of the device are easily accessible and efliciently placed.

Acircular aperture 1'1 is formed in the top face of the casing 1 and provided with a short vertically positioned cylindrical shell 18, fitted with a protective wire mesh cover 19 through which all the air entering or leaving the device passes.

Mounted in the opening 17 is a reversible, substantially noiseless motor-driven fan 20. The fan is controlled by a switch assembly 21 conveniently placed on the inner edge face of the casing. The placing of the fan directly in the opening 17 simplifies its installation, renders it directly accessible for servicing and furthermore permits it to operate at maximum efficiency.

The outer edge face of the casing is open but is preferably provided with an adjustable closure or shutter 12 hinged to the casing at 13. The closure is controlled by means of a link 15 releasably pivoted to the shutter by means of a lug 14, and operatively connected to a handle 16 as shown in Fig. 1.

A sound attenuating means, generally indicated at 22, is positioned in the casing adjacent the open edge face of the latter. The sound attenuating means is constructed to be self-contained and comprises a plurality of zigzag members or baffles 23 forming passages 30. The members 23 are held together by means of framing strips 24. The members 23 are faced with sound absorbent material 31 and the unit 22 is further covered on its top and bottom sides with sound absorbing material 25 so that passages 30 present a plurality of tortuous paths in which the sound waves suffer great attenuation but through which air may freely pass- Low back pressure to the air supplied by the fan is attained by providing ample cross-sectional area in the passages 30. Bolts 32 (Fig. 3) hold the unit 22 in position in the casing. The construction of the sound attenuating means 22, as just described, permits it to be assembled with or removed from the casing 1 as a unit through the open edge face of the casing by simply removing bolts 32 and disengaging rod 15 from lug 14. This is desirable in order that unit 22, which ac s incidentally as an air cleaner, may be removed for cleaning.

The rod 15 is preferably made of a somewhat flexible material and is so positioned as to bear against the edges of one of the baflies 23 to provide suflicient friction to hold the shutter 12 in any adjusted position.

When the lower sash 3 is raised, an opening occurs as at 33' (see Fig. 3) between the top of the lower sash and the bottom of the upper sash. To prevent sound from passing" through this opening, stripping 27 is applied, preferably to the top of the sash member 34.

What I claim is:

1. A silencing ventilator for windows which comprises a substantially fiat generally rectangular casing, having one edge face open, adapted to be positioned between a window and its sill with the open edge face opening outwardly of the window, a self contained sound attenuating means positioned in the casing adjacent said open edge, said means comprising a frame and tortuous baflle plates supported thereby, an opening formed in the upper face of the casing and positioned to be located inwardly of the window and a silent fan mounted in said opening.

2. A silencing ventilator for windows which comprises a substantially flat, generally rectangular casing adapted to be positioned between the sill and lower sash of a partiallyfopened window and having an opening outside of the window and an opening inside of'the window, independently ad'fustable sound proofing means secured to the top, bottom and sides of the easing to make a sealing engagement respectively with the lower sash, sill and side frames of the window, and sound attenuating means positioned in the casing between said outside and inside openings.

3. A silencing ventilator for windows which comprises a substantially fiat, generally rectangular casing having one edge face open, adapted to be positioned horizontally between the sill and lower sash of a partially opened window with the open end face opening outwardly of the window, independently adjustable sound proofing means secured to the top, bottom and sides of the casing to make a sealing engagement respectively with the lower sash, sill and side frames of the window, said sound proofing means being so positioned as to locate the major portion of the casing. inwardly of the window casing, sound attenuating means positioned -in the casing adjacent the open edge face, an adjust-- able closure for said open edge face, an opening formed in the upper face of the casing inwardly of the window and a silent fan mounted in said opening.

ROLAND B. BOURNE. 

